Division of Engineering;
VAX-11/780 computer. The acquisition of this computer was made possible by grants from the U.S. National Science Foundations (Grant ENG78019378);
the General Electric Foundation;
the Ford Motor Company and Digital Equipment Corporation.R.J. Asaro gratefully acknowledges support from the Metallurgy Section of the U.S. National Science Foundation under grant DMR26190. J. LeMonds and A. Needleman gratefully acknowledge the support of the U.S. National Science Foundation (Solid Mechanics Program) under grant MEA-8101948. The computations reported on here were carried out on the Brown University;